CN205027462U - Experiment instruments used for education circuit is calibrated to thermocouple - Google Patents
Experiment instruments used for education circuit is calibrated to thermocouple Download PDFInfo
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- CN205027462U CN205027462U CN201520697504.3U CN201520697504U CN205027462U CN 205027462 U CN205027462 U CN 205027462U CN 201520697504 U CN201520697504 U CN 201520697504U CN 205027462 U CN205027462 U CN 205027462U
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Abstract
The utility model relates to an experiment instruments used for education circuit is calibrated to thermocouple belongs to instruments used for education technical field. The utility model discloses a main control circuit, thermocouple voltage measurement circuit, temperature measuring circuit, display circuit, wherein main control circuit is connected with thermocouple voltage measurement circuit, temperature measuring circuit, display circuit respectively. The utility model discloses simple structure, small and exquisite, convenient to use can help the user to accomplish the thermocouple fast and calibrate the experiment and understand the experiment relevant knowledge, can play good teaching purpose.
Description
Technical field
The utility model relates to a kind of calibration on heat meter experiment teaching instrument circuit, belongs to technical field of teaching instruments.
Background technology
The ultimate principle of thermocouple temperature measurement is the material conductor composition closed-loop path of two kinds of different components, when there is thermograde in two ends, just have electric current in loop to pass through, now just there is electromotive force between two ends---thermopower, so-called Seebeck effect that Here it is.Calibration on heat meter experiment is one of College Physics infrastest, and calibration on heat meter experiment is the principle of checking thermocouple temperature measurement.When its one end of thermopair is placed in the temperature of 0 DEG C during measurement, and when the temperature of the other end changes in 0 DEG C to a certain temperature range, the close relation that is seemingly in line of its thermoelectromotive force and temperature difference.But calibration on heat meter experiment at present at least needs sensitive digital voltmeter, thermos cup, electrical heating tank etc., the experimental facilities needed is more, line is comparatively complicated, can not displays temperature in real time, the relevant informations such as voltage, and in actual applications, under thermocouple cold junction is exposed to non-standard situation, its temperature differs and is decided to be 0 DEG C, very large measuring error can be caused, so revise, this method augmenting factor revised law, tradition augmenting factor revised law needs student to carry out the calculating of repeatability to a large amount of data, this not only wastes a large amount of time, also the resentment of student is very easily caused, be unfavorable for the teaching of course, calibration on heat meter experiment equipment to student better understand thermocouple temperature measurement principle and complete calibration on heat meter experiment bring inconvenience, student and teacher high in the urgent need to a kind of cost performance, circuit connection is simple, simple to operate, the results such as experimental temperature voltage show more intuitively and are not 0 DEG C in cold junction temperature can carry out the correction of augmenting factor revised law, and automatically can calculate the calibration on heat meter experiment teaching instrument circuit of revised experimental result.
Summary of the invention
The purpose of this utility model is to provide a kind of calibration on heat meter experiment teaching instrument circuit, for solving the comparatively old problem of required more, the existing experimental facilities of instrument of existing calibration on heat meter experiment.
The technical solution of the utility model is: a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
Described main control circuit 1 comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
Described thermocouple voltages metering circuit 2 comprises operational amplifier A R1, operational amplifier A R2, thermopair JP1, potentiometer R1, potentiometer R4, resistance R2, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, wherein operational amplifier A R1 and operational amplifier A R2 power supply positive-negative input end are held with direct supply VCC respectively and are connected with ground, 2 and 4 termination capacitor C2 one end publicly of thermopair JP1 and ground GND end, the 1 termination operational amplifier A R1 normal phase input end of thermopair JP1 is also connected with electric capacity C2 one end, potentiometer R1 one end is connected with operational amplifier A R1 output terminal, the potentiometer R1 other end is connected with resistance R2 one end, the resistance R2 other end is connected with operational amplifier A R1 inverting input and resistance R5 one end, the resistance R5 other end is connected to ground, electric capacity C1 one end is connected with operational amplifier A R1 output terminal, the electric capacity C1 other end is connected to ground, operational amplifier A R1 output terminal is connected with the ADC port of single-chip microcomputer U3, the 3 termination operational amplifier A R2 normal phase input ends of thermopair JP1 are also connected with electric capacity C4 one end, potentiometer R4 one end is connected with operational amplifier A R2 output terminal, the potentiometer R4 other end is connected with resistance R6 one end, the resistance R6 other end is connected with operational amplifier A R2 inverting input and resistance R7 one end, the resistance R7 other end is connected to ground, electric capacity C3 one end is connected with operational amplifier A R2 output terminal, the electric capacity C3 other end is connected to ground, operational amplifier A R2 output terminal is connected with the ADC port of single-chip microcomputer U3.
Described temperature measuring circuit 3 comprises temperature sensor U1, temperature sensor U2, resistance R3; Wherein the vdd terminal of temperature sensor U1 and temperature sensor U2 is held with direct supply VCC and is connected, the GND end of temperature sensor U1 and temperature sensor U2 is connected to ground, temperature sensor U1 is connected with the I/O port of single-chip microcomputer U3 with the I/O port of temperature sensor U2, resistance R3 one end is held with the I/O of temperature sensor U1 and temperature sensor U2 and is connected, and the resistance R3 other end is held with direct supply VCC and is connected.
Described display circuit 4 comprises LCDs LCD1, potentiometer R8, resistance R9, exclusion RP1; Wherein the VCC end of LCDs LCD1 is electrically connected with direct supply VCC positive pole, GND end and the BGGND end of LCDs LCD1 are connected to ground, the VO end of LCDs LCD1 is connected to ground by potentiometer R8, the BGVCC end of LCDs LCD1 is connected with direct supply VCC by resistance R9, the DB end of LCDs LCD1 is electrically connected with I/O port one end of exclusion RP1 and single-chip microcomputer U3 respectively, RS, RW, E of LCDs LCD1 hold and are connected with the I/O port of single-chip microcomputer U3 respectively, and other ends of exclusion RP1 are all held with direct supply VCC and are connected.
Principle of work of the present utility model is:
On power supply after point, after high frequency spurs signal filters by electric capacity C2 and electric capacity C4, the normal phase input end of operational amplifier A R1 and operational amplifier A R2 is sent into respectively after thermopair JP1 collects signal, again through operational amplifier A R1, resistance R2, resistance R5, potentiometer R1 and operational amplifier A R2, resistance R6, resistance R7, the in-phase proportion amplifier that potentiometer R4 forms, filtered signal is amplified, amplified signal respectively through electric capacity C1 and electric capacity C3 by high frequency spurs filtering, finally this signal is transferred to the ADC port of single-chip microcomputer U3, analog voltage signal is converted to processor discernible digital signal through its internal A/D converter.When the temperature of thermocouple sensor probe segment changes, the voltage at thermocouple sensor two ends also by a certain percentage correspondence change, then this voltage signal amplifies through in-phase proportion amplifier, convert analog quantity to digital quantity through the inner AD of single-chip microcomputer U3 again, arm processor just knows present temperature after obtaining digital quantity; Because thermocouple sensor has a defect, the temperature that it is surveyed is the temperature difference between probe and cold junction, if that is only use above-mentioned circuit temperature, the temperature then only recorded when cold junction temperature is zero point is only the most accurate, the temperature of cold junction and the temperature difference at zero point larger, the temperature data recorded gets over out of true.And if while carrying out testing, if thermocouple cold junction changes, thermometric will be caused inaccurate.In order to solve the problem, add temperature sensor U2 especially as compensation, when thermopair JP1 cold junction temperature is non-vanishing, single-chip microcomputer carries out the correction of augmenting factor correction algorithm by signal measured by thermopair JP1 and temperature sensor U2 collecting temperature, and calculates revised temperature results, and in order to verify the correctness of measured temperature, the measurement carrying out in the same time to thermopair measured temperature point by temperature sensor U1, temperature sensor U1 sends to single-chip microcomputer U3 by measured temperature and by its I/O port, the DB port of the LCDs LCD1 that single-chip microcomputer U3 is also connected with the I/O port of single-chip microcomputer U3 communicates with LCDs LCD1, and by the temperature data of digital temperature sensor U1 and digital temperature sensor U1 measuring tempeature data and thermocouple measurement or send to LCDs LCD1 through the revised temperature data of augmenting factor revised law, LCDs LCD1 shows the temperature sensor measurement temperature and cold junction temperature that receive, thermocouple measuring temperature, the revised temperature of augmenting factor revised law (only showing in the non-vanishing situation of temperature sensor U2 measured temperature) data.
Described single-chip microcomputer is connected with described digital temperature sensor DS18B20 by I/O port, and read the temperature information that detects of digital temperature sensor DS18B20 and it is processed, be routine techniques, as Wang Xiaojuan, Zhang Haiyan, coolly prolong in emerging " design and implimentation based on the temperature real-time acquisition and display system of DS18B20 " literary composition, describe the mode of operation that temperature sensor DS18B20 is connected with single-chip processor i/o interface, and give and to be connected with single-chip microcomputer and to carry out the example of data processing.
Described augmenting factor revised law is routine techniques, as in Song Hongcai " thermocouple cold junction augmenting factor K value method " literary composition, describes augmenting factor correction ratio juris, has carried out correlation formula and derived and the example giving data processing.
The beneficial effects of the utility model are: structure is simple, small and exquisite, easy to use, user can be helped to complete calibration on heat meter fast and test and understand experiment relevant knowledge, can play good teaching purpose.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model;
Each label in figure: 1-main control circuit, 2-thermocouple voltages metering circuit, 3-temperature measuring circuit, 4-display circuit.
Embodiment
Embodiment 1: as shown in Figure 1, a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
Described main control circuit 1 comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
Described thermocouple voltages metering circuit 2 comprises operational amplifier A R1, operational amplifier A R2, thermopair JP1, potentiometer R1, potentiometer R4, resistance R2, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, wherein operational amplifier A R1 and operational amplifier A R2 power supply positive-negative input end are held with direct supply VCC respectively and are connected with ground, 2 and 4 termination capacitor C2 one end publicly of thermopair JP1 and ground GND end, the 1 termination operational amplifier A R1 normal phase input end of thermopair JP1 is also connected with electric capacity C2 one end, potentiometer R1 one end is connected with operational amplifier A R1 output terminal, the potentiometer R1 other end is connected with resistance R2 one end, the resistance R2 other end is connected with operational amplifier A R1 inverting input and resistance R5 one end, the resistance R5 other end is connected to ground, electric capacity C1 one end is connected with operational amplifier A R1 output terminal, the electric capacity C1 other end is connected to ground, operational amplifier A R1 output terminal is connected with the ADC port of single-chip microcomputer U3, the 3 termination operational amplifier A R2 normal phase input ends of thermopair JP1 are also connected with electric capacity C4 one end, potentiometer R4 one end is connected with operational amplifier A R2 output terminal, the potentiometer R4 other end is connected with resistance R6 one end, the resistance R6 other end is connected with operational amplifier A R2 inverting input and resistance R7 one end, the resistance R7 other end is connected to ground, electric capacity C3 one end is connected with operational amplifier A R2 output terminal, the electric capacity C3 other end is connected to ground, operational amplifier A R2 output terminal is connected with the ADC port of single-chip microcomputer U3.
Described temperature measuring circuit 3 comprises temperature sensor U1, temperature sensor U2, resistance R3; Wherein the vdd terminal of temperature sensor U1 and temperature sensor U2 is held with direct supply VCC and is connected, the GND end of temperature sensor U1 and temperature sensor U2 is connected to ground, temperature sensor U1 is connected with the I/O port of single-chip microcomputer U3 with the I/O port of temperature sensor U2, resistance R3 one end is held with the I/O of temperature sensor U1 and temperature sensor U2 and is connected, and the resistance R3 other end is held with direct supply VCC and is connected.
Described display circuit 4 comprises LCDs LCD1, potentiometer R8, resistance R9, exclusion RP1; Wherein the VCC end of LCDs LCD1 is electrically connected with direct supply VCC positive pole, GND end and the BGGND end of LCDs LCD1 are connected to ground, the VO end of LCDs LCD1 is connected to ground by potentiometer R8, the BGVCC end of LCDs LCD1 is connected with direct supply VCC by resistance R9, the DB end of LCDs LCD1 is electrically connected with I/O port one end of exclusion RP1 and single-chip microcomputer U3 respectively, RS, RW, E of LCDs LCD1 hold and are connected with the I/O port of single-chip microcomputer U3 respectively, and other ends of exclusion RP1 are all held with direct supply VCC and are connected.
Embodiment 2: as shown in Figure 1, a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
Described main control circuit 1 comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
Embodiment 3: as shown in Figure 1, a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
Described main control circuit 1 comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
Described thermocouple voltages metering circuit 2 comprises operational amplifier A R1, operational amplifier A R2, thermopair JP1, potentiometer R1, potentiometer R4, resistance R2, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, wherein operational amplifier A R1 and operational amplifier A R2 power supply positive-negative input end are held with direct supply VCC respectively and are connected with ground, 2 and 4 termination capacitor C2 one end publicly of thermopair JP1 and ground GND end, the 1 termination operational amplifier A R1 normal phase input end of thermopair JP1 is also connected with electric capacity C2 one end, potentiometer R1 one end is connected with operational amplifier A R1 output terminal, the potentiometer R1 other end is connected with resistance R2 one end, the resistance R2 other end is connected with operational amplifier A R1 inverting input and resistance R5 one end, the resistance R5 other end is connected to ground, electric capacity C1 one end is connected with operational amplifier A R1 output terminal, the electric capacity C1 other end is connected to ground, operational amplifier A R1 output terminal is connected with the ADC port of single-chip microcomputer U3, the 3 termination operational amplifier A R2 normal phase input ends of thermopair JP1 are also connected with electric capacity C4 one end, potentiometer R4 one end is connected with operational amplifier A R2 output terminal, the potentiometer R4 other end is connected with resistance R6 one end, the resistance R6 other end is connected with operational amplifier A R2 inverting input and resistance R7 one end, the resistance R7 other end is connected to ground, electric capacity C3 one end is connected with operational amplifier A R2 output terminal, the electric capacity C3 other end is connected to ground, operational amplifier A R2 output terminal is connected with the ADC port of single-chip microcomputer U3.
Embodiment 4: as shown in Figure 1, a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
Described main control circuit 1 comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
Described temperature measuring circuit 3 comprises temperature sensor U1, temperature sensor U2, resistance R3; Wherein the vdd terminal of temperature sensor U1 and temperature sensor U2 is held with direct supply VCC and is connected, the GND end of temperature sensor U1 and temperature sensor U2 is connected to ground, temperature sensor U1 is connected with the I/O port of single-chip microcomputer U3 with the I/O port of temperature sensor U2, resistance R3 one end is held with the I/O of temperature sensor U1 and temperature sensor U2 and is connected, and the resistance R3 other end is held with direct supply VCC and is connected.
Embodiment 5: as shown in Figure 1, a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
Described main control circuit 1 comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
Described display circuit 4 comprises LCDs LCD1, potentiometer R8, resistance R9, exclusion RP1; Wherein the VCC end of LCDs LCD1 is electrically connected with direct supply VCC positive pole, GND end and the BGGND end of LCDs LCD1 are connected to ground, the VO end of LCDs LCD1 is connected to ground by potentiometer R8, the BGVCC end of LCDs LCD1 is connected with direct supply VCC by resistance R9, the DB end of LCDs LCD1 is electrically connected with I/O port one end of exclusion RP1 and single-chip microcomputer U3 respectively, RS, RW, E of LCDs LCD1 hold and are connected with the I/O port of single-chip microcomputer U3 respectively, and other ends of exclusion RP1 are all held with direct supply VCC and are connected.
Embodiment 6: as shown in Figure 1, a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
Described main control circuit 1 comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
Described thermocouple voltages metering circuit 2 comprises operational amplifier A R1, operational amplifier A R2, thermopair JP1, potentiometer R1, potentiometer R4, resistance R2, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, wherein operational amplifier A R1 and operational amplifier A R2 power supply positive-negative input end are held with direct supply VCC respectively and are connected with ground, 2 and 4 termination capacitor C2 one end publicly of thermopair JP1 and ground GND end, the 1 termination operational amplifier A R1 normal phase input end of thermopair JP1 is also connected with electric capacity C2 one end, potentiometer R1 one end is connected with operational amplifier A R1 output terminal, the potentiometer R1 other end is connected with resistance R2 one end, the resistance R2 other end is connected with operational amplifier A R1 inverting input and resistance R5 one end, the resistance R5 other end is connected to ground, electric capacity C1 one end is connected with operational amplifier A R1 output terminal, the electric capacity C1 other end is connected to ground, operational amplifier A R1 output terminal is connected with the ADC port of single-chip microcomputer U3, the 3 termination operational amplifier A R2 normal phase input ends of thermopair JP1 are also connected with electric capacity C4 one end, potentiometer R4 one end is connected with operational amplifier A R2 output terminal, the potentiometer R4 other end is connected with resistance R6 one end, the resistance R6 other end is connected with operational amplifier A R2 inverting input and resistance R7 one end, the resistance R7 other end is connected to ground, electric capacity C3 one end is connected with operational amplifier A R2 output terminal, the electric capacity C3 other end is connected to ground, operational amplifier A R2 output terminal is connected with the ADC port of single-chip microcomputer U3.
Described temperature measuring circuit 3 comprises temperature sensor U1, temperature sensor U2, resistance R3; Wherein the vdd terminal of temperature sensor U1 and temperature sensor U2 is held with direct supply VCC and is connected, the GND end of temperature sensor U1 and temperature sensor U2 is connected to ground, temperature sensor U1 is connected with the I/O port of single-chip microcomputer U3 with the I/O port of temperature sensor U2, resistance R3 one end is held with the I/O of temperature sensor U1 and temperature sensor U2 and is connected, and the resistance R3 other end is held with direct supply VCC and is connected.
Embodiment 7: as shown in Figure 1, a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
Described main control circuit 1 comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
Described thermocouple voltages metering circuit 2 comprises operational amplifier A R1, operational amplifier A R2, thermopair JP1, potentiometer R1, potentiometer R4, resistance R2, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, wherein operational amplifier A R1 and operational amplifier A R2 power supply positive-negative input end are held with direct supply VCC respectively and are connected with ground, 2 and 4 termination capacitor C2 one end publicly of thermopair JP1 and ground GND end, the 1 termination operational amplifier A R1 normal phase input end of thermopair JP1 is also connected with electric capacity C2 one end, potentiometer R1 one end is connected with operational amplifier A R1 output terminal, the potentiometer R1 other end is connected with resistance R2 one end, the resistance R2 other end is connected with operational amplifier A R1 inverting input and resistance R5 one end, the resistance R5 other end is connected to ground, electric capacity C1 one end is connected with operational amplifier A R1 output terminal, the electric capacity C1 other end is connected to ground, operational amplifier A R1 output terminal is connected with the ADC port of single-chip microcomputer U3, the 3 termination operational amplifier A R2 normal phase input ends of thermopair JP1 are also connected with electric capacity C4 one end, potentiometer R4 one end is connected with operational amplifier A R2 output terminal, the potentiometer R4 other end is connected with resistance R6 one end, the resistance R6 other end is connected with operational amplifier A R2 inverting input and resistance R7 one end, the resistance R7 other end is connected to ground, electric capacity C3 one end is connected with operational amplifier A R2 output terminal, the electric capacity C3 other end is connected to ground, operational amplifier A R2 output terminal is connected with the ADC port of single-chip microcomputer U3.
Described display circuit 4 comprises LCDs LCD1, potentiometer R8, resistance R9, exclusion RP1; Wherein the VCC end of LCDs LCD1 is electrically connected with direct supply VCC positive pole, GND end and the BGGND end of LCDs LCD1 are connected to ground, the VO end of LCDs LCD1 is connected to ground by potentiometer R8, the BGVCC end of LCDs LCD1 is connected with direct supply VCC by resistance R9, the DB end of LCDs LCD1 is electrically connected with I/O port one end of exclusion RP1 and single-chip microcomputer U3 respectively, RS, RW, E of LCDs LCD1 hold and are connected with the I/O port of single-chip microcomputer U3 respectively, and other ends of exclusion RP1 are all held with direct supply VCC and are connected.
Embodiment 8: as shown in Figure 1, a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
Described main control circuit 1 comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
Described temperature measuring circuit 3 comprises temperature sensor U1, temperature sensor U2, resistance R3; Wherein the vdd terminal of temperature sensor U1 and temperature sensor U2 is held with direct supply VCC and is connected, the GND end of temperature sensor U1 and temperature sensor U2 is connected to ground, temperature sensor U1 is connected with the I/O port of single-chip microcomputer U3 with the I/O port of temperature sensor U2, resistance R3 one end is held with the I/O of temperature sensor U1 and temperature sensor U2 and is connected, and the resistance R3 other end is held with direct supply VCC and is connected.
Described display circuit 4 comprises LCDs LCD1, potentiometer R8, resistance R9, exclusion RP1; Wherein the VCC end of LCDs LCD1 is electrically connected with direct supply VCC positive pole, GND end and the BGGND end of LCDs LCD1 are connected to ground, the VO end of LCDs LCD1 is connected to ground by potentiometer R8, the BGVCC end of LCDs LCD1 is connected with direct supply VCC by resistance R9, the DB end of LCDs LCD1 is electrically connected with I/O port one end of exclusion RP1 and single-chip microcomputer U3 respectively, RS, RW, E of LCDs LCD1 hold and are connected with the I/O port of single-chip microcomputer U3 respectively, and other ends of exclusion RP1 are all held with direct supply VCC and are connected.
Embodiment 5: as shown in Figure 1, a kind of calibration on heat meter experiment teaching instrument circuit, comprises main control circuit 1, thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4; Wherein main control circuit 1 is connected with thermocouple voltages metering circuit 2, temperature measuring circuit 3, display circuit 4 respectively.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from the utility model aim.
Claims (5)
1. a calibration on heat meter experiment teaching instrument circuit, is characterized in that: comprise main control circuit (1), thermocouple voltages metering circuit (2), temperature measuring circuit (3), display circuit (4); Wherein main control circuit (1) is connected with thermocouple voltages metering circuit (2), temperature measuring circuit (3), display circuit (4) respectively.
2. calibration on heat meter experiment teaching instrument circuit according to claim 1, is characterized in that: described main control circuit (1) comprises single-chip microcomputer U3, electric capacity R10, electric capacity C5, electric capacity C6, electric capacity C7, switch S 1, crystal oscillator XT1; Wherein direct supply VCC holds and to hold with the VCC of single-chip microcomputer U3 and AVCC holds and is connected, electric capacity C7 positive pole and switch S 1 one end are electrically connected to direct supply VCC and hold, switch S 1 other end holds with the RESET of resistance R10 one end and single-chip microcomputer U3 respectively and electrochemical capacitor C7 negative pole is connected, the GND of the resistance R10 other end and single-chip microcomputer U3 holds and is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U3, and crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C5, electric capacity C6.
3. calibration on heat meter experiment teaching instrument circuit according to claim 1, it is characterized in that: described thermocouple voltages metering circuit (2) comprises operational amplifier A R1, operational amplifier A R2, thermopair JP1, potentiometer R1, potentiometer R4, resistance R2, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, wherein operational amplifier A R1 and operational amplifier A R2 power supply positive-negative input end are held with direct supply VCC respectively and are connected with ground, 2 and 4 termination capacitor C2 one end publicly of thermopair JP1 and ground GND end, the 1 termination operational amplifier A R1 normal phase input end of thermopair JP1 is also connected with electric capacity C2 one end, potentiometer R1 one end is connected with operational amplifier A R1 output terminal, the potentiometer R1 other end is connected with resistance R2 one end, the resistance R2 other end is connected with operational amplifier A R1 inverting input and resistance R5 one end, the resistance R5 other end is connected to ground, electric capacity C1 one end is connected with operational amplifier A R1 output terminal, the electric capacity C1 other end is connected to ground, operational amplifier A R1 output terminal is connected with the ADC port of single-chip microcomputer U3, the 3 termination operational amplifier A R2 normal phase input ends of thermopair JP1 are also connected with electric capacity C4 one end, potentiometer R4 one end is connected with operational amplifier A R2 output terminal, the potentiometer R4 other end is connected with resistance R6 one end, the resistance R6 other end is connected with operational amplifier A R2 inverting input and resistance R7 one end, the resistance R7 other end is connected to ground, electric capacity C3 one end is connected with operational amplifier A R2 output terminal, the electric capacity C3 other end is connected to ground, operational amplifier A R2 output terminal is connected with the ADC port of single-chip microcomputer U3.
4. calibration on heat meter experiment teaching instrument circuit according to claim 1, is characterized in that: described temperature measuring circuit (3) comprises temperature sensor U1, temperature sensor U2, resistance R3; Wherein the vdd terminal of temperature sensor U1 and temperature sensor U2 is held with direct supply VCC and is connected, the GND end of temperature sensor U1 and temperature sensor U2 is connected to ground, temperature sensor U1 is connected with the I/O port of single-chip microcomputer U3 with the I/O port of temperature sensor U2, resistance R3 one end is held with the I/O of temperature sensor U1 and temperature sensor U2 and is connected, and the resistance R3 other end is held with direct supply VCC and is connected.
5. calibration on heat meter experiment teaching instrument circuit according to claim 1, is characterized in that: described display circuit (4) comprises LCDs LCD1, potentiometer R8, resistance R9, exclusion RP1; Wherein the VCC end of LCDs LCD1 is electrically connected with direct supply VCC positive pole, GND end and the BGGND end of LCDs LCD1 are connected to ground, the VO end of LCDs LCD1 is connected to ground by potentiometer R8, the BGVCC end of LCDs LCD1 is connected with direct supply VCC by resistance R9, the DB end of LCDs LCD1 is electrically connected with I/O port one end of exclusion RP1 and single-chip microcomputer U3 respectively, RS, RW, E of LCDs LCD1 hold and are connected with the I/O port of single-chip microcomputer U3 respectively, and other ends of exclusion RP1 are all held with direct supply VCC and are connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520697504.3U CN205027462U (en) | 2015-09-10 | 2015-09-10 | Experiment instruments used for education circuit is calibrated to thermocouple |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520697504.3U CN205027462U (en) | 2015-09-10 | 2015-09-10 | Experiment instruments used for education circuit is calibrated to thermocouple |
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| CN205027462U true CN205027462U (en) | 2016-02-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108332882A (en) * | 2018-04-23 | 2018-07-27 | 山西迪思凯瑞科技有限公司 | Furnace temperature tracker verification system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108332882A (en) * | 2018-04-23 | 2018-07-27 | 山西迪思凯瑞科技有限公司 | Furnace temperature tracker verification system |
| CN108332882B (en) * | 2018-04-23 | 2024-03-08 | 山西迪思凯瑞科技有限公司 | Verification system of furnace temperature tracker |
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Granted publication date: 20160210 Termination date: 20170910 |